为什么所有其他 GPIO 都适用于 RCC，但这个会出错？

Question

我正在为我的 STM32F446RE 编写简单的 GPIO 驱动程序，有趣的是我遇到了一个问题。所以我正在定义宏和一个结构来保存 RCC 的寄存器。 GPIO 的每个端口都指向 RCC 的寄存器以连接到正确的总线。但是当我试图将该位设置为 1 时，GPIOB 给出了以下错误。“错误：'->' 的无效类型参数（有 'int'）”

#define GPIOB_PCLOCK_EN()       (RCC -> RCC_AHB1ENR |= (1 << 1)  )

typedef struct{
__vo    uint32_t RCC_CR;                //RCC clock control register
__vo    uint32_t RCC_PLLCFGR;           //RCC PLL configuration register
__vo    uint32_t RCC_CFGR;              //RCC clock configuration register
__vo    uint32_t RCC_CIR;               //RCC clock interrupt register
__vo    uint32_t RCC_AHB1RSTR;          //RCC AHB1 peripheral reset register
__vo    uint32_t RCC_AHB2RSTR;          //RCC AHB2 peripheral reset register
__vo    uint32_t RCC_AHB3RSTR;          //RCC AHB3 peripheral reset register
uint32_t RESERVED0;             //RESERVED
__vo    uint32_t RCC_APB1RSTR;          //RCC APB1 peripheral reset register
__vo    uint32_t RCC_APB2RSTR;          //RCC APB2 peripheral reset register
uint32_t RESERVED1[2];              //RESERVED
__vo    uint32_t RCC_AHB1ENR;           //RCC AHB1 peripheral clock enable register
__vo    uint32_t RCC_AHB2ENR;           //RCC AHB2 peripheral clock enable register
__vo    uint32_t RCC_AHB3ENR;           //RCC AHB3 peripheral clock enable register

__vo    uint32_t RCC_APB1ENR;           //RCC APB1 peripheral clock enable register
__vo    uint32_t RCC_APB2ENR;           //RCC APB2 peripheral clock enable register
uint32_t RESERVED2[2];              //RESERVED
__vo    uint32_t RCC_AHB1LPENR;         //RCC AHB1 peripheral clock enable in low power mode register
__vo    uint32_t RCC_AHB2LPENR;         //RCC AHB2 peripheral clock enable in low power mode register
__vo    uint32_t RCC_AHB3LPENR;         //RCC AHB3 peripheral clock enable in low power mode register
uint32_t RESERVED3;             //RESERVED
__vo    uint32_t RCC_APB1LPENR;         //RCC APB1 peripheral clock enable in low power mode register
__vo    uint32_t RCC_APB2LPENR;         //RCC APB2 peripheral clock enabled in low power mode register
uint32_t RESERVED4[2];              //RESERVED
__vo    uint32_t RCC_BDCR;              //RCC Backup domain control register
__vo    uint32_t RCC_CSR;               //RCC clock control & status register
uint32_t RESERVED5[2];              //RESERVED
__vo    uint32_t RCC_SSCGR;             //RCC spread spectrum clock generation register
__vo    uint32_t RCC_PLLI2SCFGR;        //RCC PLLI2S configuration register
__vo    uint32_t RCC_PLLSAICFGR;        //RCC PLL configuration register
__vo    uint32_t RCC_DCKCFGR;           //RCC Dedicated Clock Configuration Register
__vo    uint32_t CKGATENR;              //RCC clocks gated enable register
__vo    uint32_t DCKCFGR2;              //RCC dedicated clocks configuration register 2


}RCC_RegDef_t;

#define RCC     (RCC_RegDef_t*) RCC_BASEADDR


/*Clock Enable Presets For GPIAOs*/

#define GPIOA_PCLOCK_EN()       (RCC -> RCC_AHB1ENR |= (1 << 0)  )
//#define GPIOB_PCLOCK_EN           (RCC -> RCC_AHB1ENR |= (1 << 1)  )
#define GPIOC_PCLOCK_EN()       (RCC -> RCC_AHB1ENR |= (1 << 2)  )
#define GPIOD_PCLOCK_EN()       (RCC -> RCC_AHB1ENR |= (1 << 3)  )
#define GPIOE_PCLOCK_EN()       (RCC -> RCC_AHB1ENR |= (1 << 4)  )
#define GPIOF_PCLOCK_EN()       (RCC -> RCC_AHB1ENR |= (1 << 5)  )
#define GPIOG_PCLOCK_EN()       (RCC -> RCC_AHB1ENR |= (1 << 6)  )
#define GPIOH_PCLOCK_EN()       (RCC -> RCC_AHB1ENR |= (1 << 7)  )

Answer 1

您需要在 RCC 的替换文本两边加上括号，如下所示：

#define RCC ((RCC_RegDef_t*) RCC_BASEADDR)

表达式优先级使得 -> 比强制转换具有更高的优先级。

根据您的定义，编译器尝试使用 -> 的 LHS 操作数作为指针，但它是一个整数。

为什么所有其他 GPIO 都适用于 RCC，但这个会出错？

Why all other GPIO's are fine with RCC but this one gives error?

c

macros

microcontroller

stm32f4